select a single element of a vector based on date in matlab

To select a single element of a vector based on date in Matlab, you can use logical indexing with the datetime function. Here's an example where we have a vector of dates and a vector of corresponding values, and we want to select the value for a specific date:

main.m
dates = datetime({'2021-01-01', '2021-02-01', '2021-03-01'});
values = [10, 20, 30];

targetDate = datetime('2021-02-01');
valueForDate = values(dates == targetDate);
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Here, dates == targetDate creates a logical array of the same size as dates, with true values where the dates match targetDate and false values otherwise. We can then use this logical array to index into values to select the value corresponding to targetDate.

Note that if dates is not a datetime array, you will need to convert it using datetime before using this indexing method.